106 THE VOYAGE OF H.M.S. CHALLENGER. 
The actinal interradial areas are small, and confined to the interbrachial region, not 
appearing to extend beyond the fifth or sixth infero-marginal plate counting from the 
median interradial line ; they are occupied by small intermediate plates arranged in regular 
columns, which bear a number of small, short, skin-covered papille, with three or four 
much larger than the rest in the midst, forming a massive pedicellarian apparatus ; a 
few of the innermost plates in the large specimen have one papilla more spiniform than 
the others, and this may either be present along with the pedicellaria or in its place. 
The anal aperture is subcentral and distinct, although there is no change in the form 
of the paxillee in its neighbourhood. 
The madreporiform body is compound, and occupies a large circular area about 10 mm. 
in diameter, its outer edge being not more than 2 or 3 mm. distant from the marginal 
plates. Numerous large paxille, much greater than any of the others on the abactinal 
area, spring from, or at the junction of, the madreporic plates, almost entirely hiding the 
striated surface from superficial view. This may be seen in places, however, for the 
paxillee are not very closely placed, and here and there one is wanting. ‘The striations 
are seen to be very fine, numerous, and very slightly convoluted. The papillae which 
compose these paxille are rather more robust and distinct than those of the general 
paxillze, having more the appearance of hemispherical granules when seen from above; 
and none are modified into pedicellariz. 
Colour in alcohol, a bleached yellowish white. On one of the small specimens there 
are traces of a dark purple colour along one of the rays, but whether this is the original 
colour of the species, or is only pigment derived by abrasion from some other organism, 
I am unable to say. 
Locality.—Station 89. Between the Canaries and the Cape Verde Islands. July 
23, 1873. Lat. 22°18’ 0” N., long. 22° 2’0” W. Depth 2400 fathoms. Globigerina ooze. 
Bottom temperature 36°°6 Fahr.; surface temperature 73°5. 
2. Lonchotaster forcipifer, n. sp. (Pl. XXXI. figs. 5 and 6; Pl. XXXII. figs. 9 and 10). 
Rays five R=20mm.;r=7mm. R>3r. Breadth of a ray between the sixth 
and seventh infero-marginal plates, 5 mm. 
Disk comparatively large and inflated. Rays moderately elongate, subdepressed and 
subcarinate, narrow and tapering throughout to the extremity. Interbrachial ares wide 
and well rounded. Abactinal surface convex over the disk, the slight carination of the 
rays culminating in a distinct tumidity on the inflated disk-area at a little distance from 
the base of the ray. Actinal surface of the disk plane, but becoming rounded on the 
outer part of the ray. Lateral walls low and more or less rounded. 
The abactinal surface of the disk and rays is covered with very small and closely 
packed paxille, consisting of five to eight small, short, but comparatively robust, 
papilliform spinelets, one of which is frequently central. The tips of these papille are 
